java - JavaFX launch another application -

i've been smashing head javafx...

this works when there's no instances of application running:

public class runner {      public static void main(string[] args) {         anotherapp app = new anotherapp();         new thread(app).start();     }  }  public class anotherapp extends application implements runnable {      @override     public void start(stage stage) {     }      @override     public void run(){         launch();     } } 

but if new thread(app).start() within application exception stating can't 2 launches.

also method called observer on other application this:

@override public void update(observable o, object arg) {     // new anotherapp().start(new stage());             /* not on fx application thread; exception */      // new thread(new anotherapp()).start();             /* java.lang.illegalstateexception: application launch must not called more once */ } 

it's within javafx class such this:

public class runner extends applications implements observer {      public static void main(string[] args) {         launch(args);     }      @override     public void start(stage stage){     //...code...//     }     //...methods..//     //...methods..//      @override     public void update(observable o, object arg) {     //the code posted above//     } } 

i tried using objectproperties listeners didn't work. need new stage running within update method java.util.observer in way.

any suggestions welcomed. thanks.

application not window -- it's process. 1 application#launch() allowed per vm.

if want have new window -- create stage.

if want reuse anotherapp class, wrap in platform.runlater()

@override public void update(observable o, object arg) {     platform.runlater(new runnable() {        public void run() {                         new anotherapp().start(new stage());        }     }); }